Peak 5 / Don't know where and how to pay car note

I have 2 car notes here try to be responisble and pay my car note but don't have an address to send it to. I've tried calling all the number I was provided on the number to reach peak 5 to another company. That number just rings, and rings then a busy sound. I want to make sure that I am not going to be held to pay a fee because I don't know how to really contact and where to send my payments. This is the most cazy situation I have dealed with a company.

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I have made 2 car payment and these to car payment have been sent back to my address. I have been trying to call the 1-800 number to see what the problem is or was. But the number is not working. Where do we send the payments? The PO Box 650057 Dallas Tx. is this still the right address? Wheree do we call. I will now be making another payment and we will see what happens. I just don't want to wake up and find that my car has been taken away due to none payment.
Can anyone help?